div{background: #000; color:blue; font-size: 40px; 
text-align: center;
font-weight: bold;
}

.header{width: 100%; height: 50px; margin-bottom:10px;}
.content{width: 100%; margin-bottom:10px;background: #fff;}
.left{ height:200px; margin-bottom:10px;}
.con{height:200px; margin-bottom:10px;}
.right{height:200px;margin-bottom:10px;}
.footer{width: 100%; height: 80px;}